The Rancher and the Void-Walker

When the stars fall on Promise Valley, one woman will risk everything to protect what she loves.
Colorado Territory, 1884. Leah bat-Rachel has fought tooth and nail to keep her ranch alive after losing her parents to fever. She's proven herself in a world that doesn't believe a woman can run a spread, and she's not about to let anyone, or anything, take what's hers.
But when a silent, metallic disc descends from the night sky and steals her prize stallion in a beam of impossible light, Leah faces a threat no Winchester rifle can stop.
Enter Boaz ben-Saul, a stranger with star-fire eyes and a weapon that drinks starlight. He's a Void-Walker, an elite hunter conscripted by the Galactic Federation to track criminals across the cosmos. For eight years, he's fought on alien worlds, losing pieces of his humanity with every battle. Earth was supposed to be just another assignment, but Leah's fierce independence and love for her land awakens something in him he thought was long dead.
Together, they must infiltrate an alien base hidden in the heart of Thunder Mesa, where a ruthless crime lord known as the Collector traffics exotic creatures across the galaxy. With the help of Leah's reckless younger brother Benjamin and a magnificent cybernetic mustang with lightning in its legs, they'll face technology beyond imagination and a betrayal that cuts closer to home than they ever suspected.
But when the battle is won and the Federation comes calling, Boaz must make an impossible return to the cold, empty void between the stars, or stay and fight for the one thing he never thought he'd find again.
A home. A family. A love worth more than all the wonders of the galaxy.